Grease traps
A trap whose contents were strong enough that every pump-out was charged as high-strength waste.
reduction in BOD and suspended solids in the trap
01The plant
A commercial grease trap serving a high-load food preparation kitchen in Wisconsin.
02Before
Fats, oils, grease and suspended solids were arriving faster than the trap could hold them. BOD measured 2,328 mg/L and suspended solids 2,660 — strong enough that every pump-out was charged as high-strength waste, at about $1,029 a service, and services were frequent. Solids rebuilt between cleanings, so conventional maintenance never got ahead of it.
03Treatment
A maintenance programme dosing a grease-digesting blend into the trap, so fats were broken down where they sat instead of accumulating to be pumped away. The strains are selected for lipase activity and for staying active in the low-pH, high-grease conditions inside a loaded trap.
Every result in this library was measured at an operating plant treating with one of the formulations SediLogic supplies, over the window stated above. It is a field result published as reported, not a controlled trial we ran.
04Method
BOD, suspended solids and the pump-out charge tracked from the start through three hundred days, with readings at thirty, sixty and a hundred and fifty.
05Outcome
Most of the movement was early. BOD had roughly halved and suspended solids had fallen to 568 mg/L inside thirty days, with the charge already down to about $376; the last hundred and fifty days moved it comparatively little.
At the start
BOD 2,328 mg/L, suspended solids 2,660 mg/L, about $1,029 a pump-out.
At the close
BOD under 200 mg/L and suspended solids under 230 mg/L, both about 91 per cent down, with the pump-out charge around $20.
06Limits
Three hundred days is long enough for a kitchen's own practice to change, and nothing here records whether it did. Nothing was left untreated. The pumping charge is a billing figure and follows how the hauler prices strength, so it tracks the analysis rather than adding anything to it. No facility is named.
Only the volatile organic fraction of a sludge responds to any of this. Grit, sand, silt, mineral precipitates and plastics remain at any dose, here and everywhere else.
—What we would supply
SediLogic Liquid FOG is the article in the range built for this — a liquid concentrate aimed at fats, oils and grease and dosed into the collection system rather than at a lagoon blanket. A trap takes a metered or poured dose; a sinking solid has nothing to sink to.
SediLogic holds a written dose table for wastewater lagoons and for no other duty, so the planner will not size a trap and we will not guess at one. Tell us the trap, the flow and what it is loaded with, and a quantity is settled with a person.
—Read next
Grease traps
IndustrialOngoing, first results in weeks
reduction in fats, oils and grease
Three restaurant kitchens sharing interceptors that were filling faster than the pump-out schedule could keep up with, with grease backing up into sinks between visits.
Grease traps
Industrial2 years
fewer blockage incidents in the second year
Grease building in kitchen and deli drain lines fast enough to generate a steady run of blockages and emergency call-outs.
Grease traps
IndustrialNot published
less oil accumulation in the trap
Oil accumulating in the trap faster than the cleaning contract allowed for, and taking a long time to clear at each visit.
Your lagoon next
A different plant, a different loading and a different sludge. What decides your result is how much of your own accumulation is organic and treatable, and whether the dose is sized against the lagoon in front of us rather than read off this page. Tell us the dimensions and we will size it.
